CN112731125A - System and method for detecting action exit time of protection device - Google Patents
System and method for detecting action exit time of protection device Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The invention discloses a device and a method for detecting the action exit time of a protection device. The system comprises a digital tester, a detection loop, a sampling loop and a processor; the digital tester is connected with the detection loop, and the detection loop is connected with the processor; the digital tester is used for applying fault quantity to the protection device and simultaneously sending a detection signal; the detection loop is used for outputting an electric signal when the detection signal is detected; the sampling loop is connected with an outlet pressure plate of the protection device and the processor, the processor starts timing according to the electric signal output by the detection loop and closes timing according to the voltage amplitude acquired by the sampling loop, and the recorded time is the required protection action outlet time. The scheme provided by the invention can realize visual detection and measurement of the action exit time of the protection device, avoids manual measurement and is safer in engineering application.
Description
Technical Field
The embodiment of the invention relates to a relay protection timing technology, in particular to a system and a method for detecting the action exit time of a protection device.
Background
Since the relay protection device plays an important role in the safe and stable operation of the power grid, the relay protection device needs to be checked regularly.
Because the potential change time caused by the protection action of the protection device is short, namely the action exit time of the protection device is short, a worker can hardly use a universal meter to visually observe the potential change and the actual action time of the protection device, and the inspection of the action exit time of the protection device is lack of intuition and accuracy.
Disclosure of Invention
The invention provides a system and a method for detecting the action exit time of a protection device, which realize the visual detection and measurement of the action exit time of the protection device.
In a first aspect, an embodiment of the present invention provides a system for detecting an action exit time of a protection device, including a digital tester, a detection loop, a sampling loop, and a processor;
the digital tester is connected with the detection loop, and the detection loop is connected with the processor; the digital tester is used for applying fault quantity to the protection device and simultaneously sending a detection signal;
the detection loop is used for outputting an electric signal when the detection signal is detected;
the sampling loop is connected with an outlet pressure plate of the protection device and the processor, the processor starts timing according to the electric signal output by the detection loop and closes timing according to the voltage amplitude acquired by the sampling loop, and the recorded time is the required protection action outlet time.
Optionally, the detection circuit includes a normally open contact, a first end of the normally open contact is grounded, a second end of the normally open contact is connected to an input side of the first optical coupler, and an output side of the first optical coupler is connected to the processor;
and the digital tester controls the normally open contact to be closed.
Optionally, the sampling loop comprises an input positive terminal and an input negative terminal;
the sampling loop further comprises an operational amplifier circuit and a second optical coupler;
the action switch of the protection device is connected with the anode of the control power supply, and the cathode of the control power supply is grounded; the input positive end of the sampling loop is connected with the outlet pressure plate of the protection device and the input end of the operational amplifier circuit; the output end of the operational amplifier circuit is connected with the input end of the second optical coupler; and the output end of the second optical coupler is connected with the processor.
Optionally, the sampling loop comprises an input positive terminal and an input negative terminal;
the sampling loop further comprises an operational amplifier circuit and a second optical coupler;
the action switch of the protection device is connected with the input negative end of the sampling loop, and the input positive end of the sampling loop is connected with the outlet pressing plate of the protection device and the input end of the operational amplifier circuit; the input negative end of the sampling loop is connected with the first end of a normally open switch and the first end of a normally closed switch of the relay; the second end of the normally closed switch is grounded; the second end of the normally open switch is connected with a first power supply;
the output end of the operational amplifier circuit is connected with the input end of the second optical coupler; the output end of the second optical coupler is connected with the processor;
the relay is electrically connected with a driving circuit, and the driving circuit is electrically connected with the processor; the processor is used for controlling the normally closed switch and the normally open switch through the driving circuit.
Optionally, the system further comprises a display;
the display is connected with the processor.
Optionally, the display is used for information display and parameter setting.
Optionally, the method further includes: the power supply comprises a first power supply module, a second power supply module and a third power supply module;
the third power supply module is used for converting voltage into the working voltage of the first power supply module and the working voltage of the second power supply module;
the first power module and the second power module are used for supplying power to the detection loop, the sampling loop and the processor.
In a second aspect, an embodiment of the present invention provides a method for detecting an exit time of an action of a protection device, where the method is performed by a system for detecting an exit time of an action of a protection device, where the system for detecting an exit time of an action of a protection device includes: the device comprises a digital tester, a detection circuit, a sampling circuit and a processor;
the system for detecting the action exit time of the protection device comprises: the device comprises a digital tester, a detection circuit, a sampling circuit and a processor;
the digital tester is connected with the detection loop, and the detection loop is connected with the processor;
the sampling loop is connected with the outlet pressure plate of the protection device and the processor;
the method comprises the following steps: the digital tester is used for applying fault quantity to the protection device and simultaneously sending a detection signal;
the detection circuit outputs an electrical signal when detecting the detection signal; and the processor starts timing according to the electric signal output by the detection loop and closes timing according to the voltage amplitude acquired by the sampling loop, and the recorded time is the required protection action exit time.
Optionally, when the control switch detects that the digital tester sends a signal instruction, the control switch is closed, and the processor starts timing according to the electrical signal output by the detection loop.
Optionally, the processor is provided with a voltage amplitude threshold;
and the processor is used for closing the processor for timing if the voltage amplitude acquired by the sampling loop is greater than the voltage amplitude threshold value.
According to the system and the method for detecting the action exit time of the protection device, timing is started through the processor according to the electric signal detected by the detection loop, timing is closed according to the voltage amplitude acquired by the sampling loop, and the recorded time is the required protection action exit time. The visual detection and measurement of the action exit time of the protection device are realized, manual measurement is avoided, and the method is safer in engineering application.
Drawings
Fig. 1 is a schematic diagram of a system for detecting an exit time of a protection device according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a detection loop circuit according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a sampling loop circuit according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of another sampling loop circuit according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of another system for detecting an exit time of a protection device according to an embodiment of the present invention.
Fig. 6 is a schematic block diagram of a method for detecting an exit time of an operation of a protection device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The relay protection device plays a crucial role in the safe and stable operation of a power grid, relay protection workers need to regularly check the relay protection device, the relay protection workers are limited by power failure conditions and often adopt a mode of not cutting off power or directly driving a switch to carry out protection regular inspection, whether the protection device and a related secondary circuit are normal or not is judged by detecting the potential of a protection outlet pressure plate, but the action outlet time of the protection device is short, and the potential change and the action time of the protection device are difficult to visually detect by using conventional instruments such as a universal meter and the like.
Fig. 1 is a schematic diagram of a system for detecting an action exit time of a protection device according to an embodiment of the present invention, and referring to fig. 1, the system for detecting an action exit time of a protection device according to an embodiment of the present invention includes a digital tester 110, a detection circuit 120, a sampling circuit 130, and a processor 140;
the digital tester 110 is connected with the detection circuit 120, and the detection circuit 120 is connected with the processor 140; the digital tester 110 is used for sending a detection signal while applying a fault amount to the protection device;
the detection loop is used for outputting an electric signal when detecting the detection signal;
the sampling loop is connected with the outlet pressure plate of the protection device 150 and the processor 140, the processor 140 starts timing according to the electric signal output by the detection loop 120 and closes timing according to the voltage amplitude value collected by the sampling loop 130, and the recorded time is the required protection action outlet time.
Specifically, the digital tester 110 may use an ONLLY model digital tester, and the digital tester 110 is electrically connected to the detection circuit 120 through a cable; the digital tester 110 outputs a detection signal, and the detection circuit 120 outputs an electrical signal when receiving the detection signal. The processor 140 is electrically connected to the output end of the detection circuit 120, and when the processor 140 receives the electrical signal output by the detection circuit 120, the internal timer is started to start timing. The sampling circuit 130 is connected to the outlet platen of the protection device 150, and the sampling circuit 130 can sample the voltage of the outlet platen of the protection device 150. When the digital tester 110 applies a failure amount to the protection device 150, the voltage of the outlet platen changes after the protection device 150 operates. The output end of the sampling loop is electrically connected with the processor, the sampling loop 130 sends the sampling voltage signal to the processor 140, and the processor 140 can close an internal timer according to the voltage amplitude of the pressure plate at the outlet of the sampling protection device 150 of the sampling loop 130 to close the timing. The time recorded is the required protection action exit time. In this case, the digital tester 110 applies the failure amount and the open operation of the detection signal to the protection device 150 to be executed simultaneously.
According to the system and the method for detecting the action exit time of the protection device, timing is started through the processor according to the electric signal detected by the detection loop, timing is closed according to the voltage amplitude acquired by the sampling loop, and the recorded time is the required protection action exit time. The visual detection and measurement of the action exit time of the protection device are realized, manual measurement is avoided, and the method is safer in engineering application.
Fig. 2 is a schematic circuit diagram of a detection circuit according to an embodiment of the present invention, referring to fig. 2, optionally, the detection circuit includes a normally open contact 210, a first end of the normally open contact 210 is grounded, a second end of the normally open contact 210 is connected to an input side of a first optical coupler 220, and an output side of the first optical coupler 220 is connected to a processor;
the digital tester 110 controls the normally open contact 210 to close.
Specifically, the normally open contact 210 of the detection circuit is connected to the digital tester 110 through a cable, and when the digital tester 110 sends a detection signal to the normally open contact 210, the normally open contact 210 will be closed, and the whole detection circuit will conduct the detection circuit and output an electrical signal to the processor 140. When no detection signal exists, the normally open contact is in a normally open state, and timing errors caused by the fact that a noise signal is conducted on a detection loop by mistake are avoided. Wherein first optical coupler 220 input side is connected with normally open contact 210, and first optical coupler 210 output side is connected with treater 140, and optical coupler can realize signal unidirectional transmission, and input side and output side realize electrical isolation to make the detection signal of detection circuit input side have no influence to the output signal of telecommunication, the interference killing feature is strong, and work is more stable.
Fig. 3 is a schematic diagram of a sampling loop circuit according to an embodiment of the present invention, and referring to fig. 3, optionally, the sampling loop includes an input positive terminal 2 and an input negative terminal 3;
the sampling loop also comprises an operational amplifier circuit and a second optical coupler;
the action switch 310 of the protection device is connected with the anode of the control power supply 320, and the cathode of the control power supply 320 is grounded; the input positive end of the sampling loop is connected with an outlet pressure plate of the protection device and the input end of the operational amplifier circuit; the output end of the operational amplifier circuit is connected with the input end of the second optical coupler 330; the output of the second optical coupler 330 is connected to the processor 140.
Specifically, the substations adopt a direct current system of DC110V or DC220V, so that the positive pole potential of the control power source 320 is DC55V or DC 110V. The protection device operation switch 310 is connected to the positive electrode of the control power source 320, and the connection point is 1. The negative electrode of the control power supply is grounded and can be connected to the ground grid of the transformer substation or the input negative end 3 of the sampling loop and the same ground wire. The digital tester adds analog current and voltage fault quantity to the protection device, and the protection device acts, so that the action switch 310 of the protection device is closed. An outlet pressure plate of the protection device is connected with an input positive end 2, and an input positive end voltage signal is output to the processor through the operational amplifier circuit, the voltage division circuit and the coupling circuit of the second optical coupler. And because the precision requirement of the signal transmitted by the second optical coupler is higher, a linear optical coupler can be adopted. The processor integrates a 16bits ADC and obtains the real-time voltage amplitude through analog-to-digital conversion. Illustratively, when the voltage amplitude of the collecting contact 2 after the protection action is DC55V or DC110V, the voltage amplitude threshold of the processor is set by a program, the voltage amplitude threshold is set to 30V, the collected voltage amplitude exceeds the voltage amplitude threshold by 30V, the internal timer stops timing, and the recorded time is the required protection action exit time. The input positive end of the sampling loop firstly passes through the operational amplifier, the input resistance of the sampling loop can be increased, and when the outlet pressing plates of a plurality of protection devices are detected to be connected in parallel, direct current grounding of a transformer substation cannot be caused.
Fig. 4 is a schematic diagram of another sampling loop circuit provided in an embodiment of the present invention, and referring to fig. 4, alternatively, the sampling loop includes an input positive terminal 2 and an input negative terminal 3;
the sampling loop also comprises an operational amplifier circuit and a second optical coupler;
the action switch 310 of the protection device is connected with the input negative terminal 3 of the sampling loop, and the input positive terminal 2 of the sampling loop is connected with the outlet pressing plate of the protection device and the input end of the operational amplifier circuit; the negative input end 3 of the sampling loop is connected with the first end of a normally open switch 410 and the first end of a normally closed switch 420 of the relay; the second terminal of the normally-closed switch 420 is grounded; the second end of the normally open switch 410 is connected to the first power supply;
the output end of the operational amplifier circuit is connected with the input end of the second optical coupler 330; the output end of the second optical coupler 330 is connected with the processor 140;
the relay 430 is electrically connected with a driving circuit 440, and the driving circuit 440 is electrically connected with the processor 140; the processor 140 is configured to control the normally closed switch 420 and the normally open switch 410 via the driving circuit 440.
Specifically, the negative input terminal 3 of the sampling loop is connected to the relay 430, wherein the relay 430 may be a magnetic relay. The closed and open states of the normally open switch 410 and the normally closed switch 420 of the relay 430 are controlled by the electrical signal through the driving circuit 440. Referring to fig. 4 in conjunction with fig. 3, when the operation loop of the protection device in the substation is complete, that is, the action switch 310 of the protection device is connected to the positive electrode of the control power supply, the negative electrode of the control power supply is grounded, the normally open switch 410 connected to the first power supply of the DC12V is opened, the normally closed switch 420 connected to the ground is closed, and the negative electrode of the control power supply is grounded and can be connected to the input negative terminal 3 of the substation grounding grid or the sampling loop to the same ground. Sampling loop voltage sampling is realized based on the above embodiment.
When the protection device operating loop is not complete in the substation, i.e. the action switch 310 of the protection device is not connected to the control power supply, as shown in fig. 4. The action switch 310 of the protection device is connected with the input negative terminal 3 of the sampling loop, i.e. the contact 1 is connected with the input negative terminal 3, and the input positive terminal 2 has no positive power supply, so that the potential of the outlet pressure plate, i.e. the contact 2 in fig. 4, is still zero after the protection action, and under the condition of no control power supply, the processor 140 can set an open signal, so that the driving circuit 440 drives the relay 430, thereby controlling the normally open switch 410 to be closed, and the normally closed switch 420 to be open, so that the potential of the input positive terminal is DV12V after the protection action. The input positive terminal 2 voltage signal is output to the processor 140 through the operational amplifier circuit, the voltage divider circuit and the second optical coupler. And the signal transmitted by the second optical coupler has higher precision requirement, so that the linear optical coupler is adopted. The processor integrates a 16bits ADC and obtains the real-time voltage amplitude through analog-to-digital conversion. And setting a voltage amplitude threshold value compared by the processor at the moment according to engineering application, closing an internal timer if the acquired voltage amplitude value exceeds the voltage amplitude threshold value, and recording the time which is the required protection action exit time. The input positive end of the sampling loop firstly passes through the operational amplifier, the input resistance of the sampling loop can be increased, and when the outlet pressing plates of a plurality of protection devices are detected to be connected in parallel, direct current grounding of a transformer substation cannot be caused. Meanwhile, the situation of no control power supply is realized, and the time of the action outlet of the passive protection device can be detected.
Fig. 5 is a schematic diagram of another system for detecting the action exit time of the protection device according to the embodiment of the present invention, referring to fig. 5, optionally, further including a display 510;
a display 510 is coupled to the processor 140.
Optionally, the display 510 is used for information display and parameter setting.
Optionally, the method further includes: a first power module 520, a second power module 530, and a third power module 540;
the third power module 540 is used for converting the voltage into the working voltage of the first power module 520 and the working voltage of the second power module 530;
the first power module 520 and the second power module 530 are used to supply power to the detection loop 120, the sampling loop 130, and the processor.
Specifically, the display is a touch display and is connected with the processor. The voltage amplitude threshold parameter and the signal for starting the relay driving circuit can be set to the processor through the touch function. And the device is used for displaying the set parameter information and the set detection result information, so that man-machine interaction is realized, operators can know the detection setting more clearly, and the working efficiency is improved. The third power module employs a DC5V lithium battery to convert the voltage to a first power module operating voltage DC12V and a second power module operating voltage DC3.3V. Wherein the first power module operating voltage DC12V may be used to provide a first power supply to the display. The second power module operating voltage DC3.3V may be used to provide a second power supply to the processor. The first power module operating voltage DC12V and the second power module operating voltage DC3.3V may be used for the detection loop and the sampling loop to provide the respective first power supply and second power supply. The miniaturized structure of the instrument is realized by being beneficial to the integration of the power module.
An embodiment of the present invention provides a method for detecting an action exit time of a protection device, fig. 6 is a schematic block diagram of a method for detecting an action exit time of a protection device according to an embodiment of the present invention, and referring to fig. 6, the method is executed by a system for detecting an action exit time of a protection device, and the system for detecting an action exit time of a protection device includes: the device comprises a digital tester, a detection circuit, a sampling circuit and a processor;
the digital tester is connected with the detection loop, and the detection loop is connected with the processor;
the sampling loop is connected with an outlet pressure plate of the protection device and the processor;
the method comprises the following steps: the digital tester is used for applying fault quantity to the protection device and simultaneously sending a detection signal;
the detection circuit outputs an electric signal when detecting the detection signal; and the processor starts timing according to the electric signal output by the detection loop and closes timing according to the voltage amplitude acquired by the sampling loop, and the recorded time is the required protection action exit time.
Specifically, after the digital tester sends the detection signal, the detection circuit outputs an electric signal to the processor, and the processor starts an internal timer to start timing. The digital tester applies fault quantity to the protection device, the voltage of the outlet pressing plate changes after the protection device acts, the sampling circuit detects the voltage of the outlet pressing plate of the protection device, and the processor can close an internal timer according to the voltage of the outlet pressing plate of the sampling circuit sampling protection device and close timing. The time recorded is the required protection action exit time. Wherein the digital tester applies the fault amount and the opening action of the detection signal to the protection device to be executed simultaneously. The visual detection and measurement of the action exit time of the protection device are realized, manual measurement is avoided, and the method is safer in engineering application.
Optionally, the detection circuit includes a normally open contact, and when the normally open contact detects an electrical signal, the normally open contact is closed, and the processor starts timing according to the electrical signal output by the detection circuit.
Specifically, after the digital tester sends the detection signal, the normally open contact of the detection loop is closed, and the whole detection loop can be conducted to output an electric signal to the processor. When no detection signal exists, the normally open contact is in a normally open state, and timing errors caused by the fact that a noise signal is conducted on a detection loop by mistake are avoided.
Optionally, the processor is provided with a voltage amplitude threshold;
and the processor is used for closing the processor for timing if the voltage amplitude acquired by the sampling loop is greater than the voltage amplitude threshold value.
Specifically, based on the above embodiments, when the operation loop of the protection device in the substation is complete, that is, the action switch of the protection device is connected to the positive pole of the control power supply, the negative pole of the control power supply is grounded, and the substation adopts the DC system of DC110V or DC220V, so that the positive pole potential of the control power supply is DC55V or DC 110V. When the voltage after the protection action is DC55V or DC110V, the voltage amplitude threshold of the processor is set by a program, for example, the voltage amplitude threshold is set to 30V, when the voltage amplitude exceeding the voltage amplitude threshold by 30V is detected, the internal timer stops timing, and the recorded time is the required protection action exit time.
When the operation loop of the protection device in the transformer substation is incomplete, namely the action switch of the protection device is not connected with the control power supply, the potential of the input positive terminal is DV12V after the protection action. And setting a voltage amplitude threshold value compared by the processor at the moment according to engineering application, closing an internal timer if the acquired voltage amplitude value exceeds the voltage amplitude threshold value, and recording the time which is the required protection action exit time. The time of the action outlet of the passive protection device can be detected even if the control power supply is not available.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A system for detecting the action exit time of a protection device is characterized by comprising a digital tester, a detection loop, a sampling loop and a processor;
the digital tester is connected with the detection loop, and the detection loop is connected with the processor; the digital tester is used for applying fault quantity to the protection device and simultaneously sending a detection signal;
the detection loop is used for outputting an electric signal when the detection signal is detected;
the sampling loop is connected with an outlet pressure plate of the protection device and the processor, the processor starts timing according to the electric signal output by the detection loop and closes timing according to the voltage amplitude acquired by the sampling loop, and the recorded time is the required protection action outlet time.
2. The system for detecting the exit time of the protection device according to claim 1,
the detection circuit comprises a normally open contact, the first end of the normally open contact is grounded, the second end of the normally open contact is connected with the input side of the first optical coupler, and the output side of the first optical coupler is connected with the processor;
and the digital tester controls the normally open contact to be closed.
3. The system for detecting the exit time of the protection device according to claim 1,
the sampling loop comprises an input positive terminal and an input negative terminal;
the sampling loop further comprises an operational amplifier circuit and a second optical coupler;
the action switch of the protection device is connected with the anode of the control power supply, and the cathode of the control power supply is grounded; the input positive end of the sampling loop is connected with the outlet pressure plate of the protection device and the input end of the operational amplifier circuit; the output end of the operational amplifier circuit is connected with the input end of the second optical coupler; and the output end of the second optical coupler is connected with the processor.
4. The system for detecting the exit time of the protection device according to claim 1,
the sampling loop comprises an input positive terminal and an input negative terminal;
the sampling loop further comprises an operational amplifier circuit and a second optical coupler;
the action switch of the protection device is connected with the input negative end of the sampling loop, and the input positive end of the sampling loop is connected with the outlet pressing plate of the protection device and the input end of the operational amplifier circuit; the input negative end of the sampling loop is connected with the first end of a normally open switch and the first end of a normally closed switch of the relay; the second end of the normally closed switch is grounded; the second end of the normally open switch is connected with a first power supply;
the output end of the operational amplifier circuit is connected with the input end of the second optical coupler; the output end of the second optical coupler is connected with the processor;
the relay is electrically connected with a driving circuit, and the driving circuit is electrically connected with the processor; the processor is used for controlling the normally closed switch and the normally open switch through the driving circuit.
5. The system for detecting the exit time of a protection device according to claim 1, further comprising a display;
the display is connected with the processor.
6. A system for detecting the exit time of a protection device according to claim 5,
the display is used for information display and parameter setting.
7. The system for detecting the exit time of a protection device according to claim 1, further comprising: the power supply comprises a first power supply module, a second power supply module and a third power supply module;
the third power supply module is used for converting voltage into the working voltage of the first power supply module and the working voltage of the second power supply module;
the first power module and the second power module are used for supplying power to the detection loop, the sampling loop and the processor.
8. A method for detecting the action exit time of a protection device is executed by a system for detecting the action exit time of the protection device and is characterized in that,
the system for detecting the action exit time of the protection device comprises: the device comprises a digital tester, a detection circuit, a sampling circuit and a processor;
the digital tester is connected with the detection loop, and the detection loop is connected with the processor;
the sampling loop is connected with the outlet pressure plate of the protection device and the processor;
the method comprises the following steps: the digital tester is used for applying fault quantity to the protection device and simultaneously sending a detection signal;
the detection circuit outputs an electrical signal when detecting the detection signal; and the processor starts timing according to the electric signal output by the detection loop and closes timing according to the voltage amplitude acquired by the sampling loop, and the recorded time is the required protection action exit time.
9. The method for detecting the exit time of the protection device according to claim 8,
the detection circuit comprises a normally open contact, when the normally open contact detects the detection signal electric signal, the normally open contact is closed, and the processor starts timing according to the electric signal output by the detection circuit.
10. The method for detecting the exit time of the protection device according to claim 8,
the processor is provided with a voltage amplitude threshold;
and the processor is used for closing the processor for timing if the voltage amplitude acquired by the sampling loop is greater than the voltage amplitude threshold value.
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| CN202011413008.2A CN112731125A (en) | 2020-12-03 | 2020-12-03 | System and method for detecting action exit time of protection device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113589061A (en) * | 2021-06-09 | 2021-11-02 | 广东电网有限责任公司广州供电局 | Relay protection outlet testing device |
| CN113848472A (en) * | 2021-10-21 | 2021-12-28 | 广东电网有限责任公司 | State monitoring device |
| CN113866534A (en) * | 2021-08-25 | 2021-12-31 | 广东电网有限责任公司广州供电局 | Secondary circuit signal detection system |
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| CN113848472A (en) * | 2021-10-21 | 2021-12-28 | 广东电网有限责任公司 | State monitoring device |
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Application publication date: 20210430 |